Sulfonic-functionalized heteropolyacid-silica nanoparticles for high temperature operation of a direct methanol fuel cell

Hyun Jong Kim, Yong Gun Shul, Haksoo Han

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Sulfonic-functionalized heteropolyacid-SiO2 nanoparticles were synthesized by grafting and oxidizing of a thiol-silane compound onto the heteropolyacid-SiO2 nanoparticle surface. The surface functionalization was confirmed by solid-state NMR spectroscopy. The composite membrane containing the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was prepared by blending with Nafion® ionomer. TG-DTA analysis showed that the composite membrane was thermally stable up to 290 °C. The DMFC performance of the composite membrane increased the operating temperature from 80 to 200 °C. The function of the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was to provide a proton carrier and act as a water reservoir in the composite membrane at elevated temperature. The power density was 33 mW cm-2 at 80 °C, 39 mW cm-2 at 160 °C and 44 mW cm-2 at 200 °C, respectively.

Original languageEnglish
Pages (from-to)137-142
Number of pages6
JournalJournal of Power Sources
Volume158
Issue number1
DOIs
Publication statusPublished - 2006 Jul 14

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High temperature operations
Direct methanol fuel cells (DMFC)
Composite membranes
Silicon Dioxide
fuel cells
methyl alcohol
Silica
Nanoparticles
silicon dioxide
membranes
nanoparticles
composite materials
Silanes
Ionomers
operating temperature
Sulfhydryl Compounds
thiols
silanes
Differential thermal analysis
Nuclear magnetic resonance spectroscopy

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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abstract = "Sulfonic-functionalized heteropolyacid-SiO2 nanoparticles were synthesized by grafting and oxidizing of a thiol-silane compound onto the heteropolyacid-SiO2 nanoparticle surface. The surface functionalization was confirmed by solid-state NMR spectroscopy. The composite membrane containing the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was prepared by blending with Nafion{\circledR} ionomer. TG-DTA analysis showed that the composite membrane was thermally stable up to 290 °C. The DMFC performance of the composite membrane increased the operating temperature from 80 to 200 °C. The function of the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was to provide a proton carrier and act as a water reservoir in the composite membrane at elevated temperature. The power density was 33 mW cm-2 at 80 °C, 39 mW cm-2 at 160 °C and 44 mW cm-2 at 200 °C, respectively.",
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Sulfonic-functionalized heteropolyacid-silica nanoparticles for high temperature operation of a direct methanol fuel cell. / Kim, Hyun Jong; Shul, Yong Gun; Han, Haksoo.

In: Journal of Power Sources, Vol. 158, No. 1, 14.07.2006, p. 137-142.

Research output: Contribution to journalArticle

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AB - Sulfonic-functionalized heteropolyacid-SiO2 nanoparticles were synthesized by grafting and oxidizing of a thiol-silane compound onto the heteropolyacid-SiO2 nanoparticle surface. The surface functionalization was confirmed by solid-state NMR spectroscopy. The composite membrane containing the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was prepared by blending with Nafion® ionomer. TG-DTA analysis showed that the composite membrane was thermally stable up to 290 °C. The DMFC performance of the composite membrane increased the operating temperature from 80 to 200 °C. The function of the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was to provide a proton carrier and act as a water reservoir in the composite membrane at elevated temperature. The power density was 33 mW cm-2 at 80 °C, 39 mW cm-2 at 160 °C and 44 mW cm-2 at 200 °C, respectively.

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